1796-PM3000LC2控制器精品

S7-300与S7-200通过EM277进行PROFIBUS DP通讯，需要在STEP7中进行S7-300站组态，在S7-200系统中不需要对通讯进行组态和编程，只需要将要进行通讯的数据整理存放在V 存储区与S7-300的组态EM277从站时的硬件I/O地址相对应就可以了。插入一个S7-300的站：
选中STEP7的硬件组态窗口中的菜单 Optionà Install new GSD，导入SIEM089D.GSD文件，安装EM277从站配置文件，在SIMATIC文件夹中有EM277的GSD文件。导入GSD文件后，在右侧的设备选择列表中找到EM277从站，PROFIBUS DPàAdditional Field DevicesàPLCàSIMATICàEM277,并且根据您的通讯字节数，选择一种通讯方式，本例中选择了8字节入/8字节出的方式。
根据EM277上的拨位开关设定以上EM277从站的站地址，组态完系统的硬件配置后，将硬件信息下载到S7-300的PLC当中。
S7-300的硬件下载完成后，将EM277的拨位开关拨到与以上硬件组态的设定值一致，在S7-200中编写程序将进行交换的数据存放在VB0－VB15，对应S7-300的PQB0-PQB7和PIB0-PIB7，打开STEP7中的变量表和STEP7 MicroWin32的状态表进行监控
注意：VB0－VB7是S7－300写到S7－200的数据，VB8－VB15是S7－300从S7－200读取的值。EM277上拨位开关的位置一定要和S7－300中组态的地址值一致。

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